Filter



FIG. 1 is a front perspective view of the filter;

FIG. 2 is a front elevation view of the filter;

FIG. 3 is a left elevation view of the filter;

FIG. 4 is a right elevation view of the filter;

FIG. 5 is a rear elevation view of the filter;

FIG. 6 is a top plan view of the filter; and,

FIG. 7 is a bottom plan view of the filter.

The broken line in FIGS. 1-5 and 7 is for illustrate purposes only and forms no part of the claimed design. 

The ornamental design for a filter, as shown and described. 